Collapsible bollard



FIG. 1 is a front perspective view of a collapsible bollard showing ournew design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a side elevational view thereof.

The ornamental design for a collapsible bollard, as shown and described.